Looks like an old Britstand drawn grader. The predecessor of the motor grader. Made in Rosebery, Sydney. Still being made into the 1950's and the occasional shire council was still trying it on to trade in one of the pieces of crap in the 1980's. Usually pulled by a farm type tractor. They had an axle and wheels on the rear and an operator stood on a platform and turned hand wheels to raise, lower, and angle the blade.